This website offers free educational activities and instruction in virtually all the major disciplines, including test prep for high school SAT. There's even a section that offers strategies on how to master multiple choice tests. To use the site, first browse on the right, activities by grade and topic. You can choose reading, writing, social studies, even arts and crafts. Then select the grade level. I've looked at a number of the suggestions they offer for making learning a fun experience and most of them are pretty good. For example, to learn how to do simple math, they provide instructions on how to craft an abacus out of a shoe box, colored o-shaped cereal, floral cloth wire and a glue gun. For third grade science you create a glass xylophone which you fill to different levels with colored  liquids. Then you discuss why the sounds are different based upon the water levels.

There are also a lot of worksheets and printables for kindergarten through the fifth grade. These cover math, reading, social studies and geography. There are also printable games such as Space Science Word Scrambler for fourth graders, Practicing Homonyms for the fifth grade, Cursive Handwriting and much much more. If you're interested in eLearning, such as a foreign language they provide a link for software, but there is a charge for that. There's also something called Nutshell Math which is a program that offers explanations and demonstrations to actual math homework problems that your child might have. That one lists a price of $7.95 a month. However, everything else on the site is free, and well worth looking at in my opinion.